Sauna heater



FIG. 1 is a perspective view of the sauna heater;

FIG. 2 is a front elevation view of the sauna heater;

FIG. 3 is a right side elevation view of the sauna heater;

FIG. 4 is a left side elevation view of the sauna heater;

FIG. 5 is a rear elevation view of the sauna heater;

FIG. 6 is a top plan view of the sauna heater; and,

FIG. 7 is a bottom plan view of the sauna heater.

Broken lines shown in the drawings are for purposes of illustrating portions of the sauna heater and form no part of the claimed design. 

CLAIM The ornamental design for a sauna heater, as shown and described. 